Is this the error you're getting?http://www.lucasforums.com/showthread.php?t=202740
There is more than one patch. The FOCUpdate1_1.exe patch fixes a lot of things, but maybe not your problem. The other patch is for 64-bit Windows. The patches are described on the LucasArts site, though the links on that page don't work anymore (don't know if that happened before or after the Disney takeover)https://www.lucasarts.com/support/update/EAWFOC1_1.html
If you want the 2nd patch, it's at Gamefronthttp://www.gamefront.com/files/20715796/FOC_RAM_MPLobby_update_exe
From the description at LucasArts, you have to install the FOCUpdate1_1.exe patch first, then the FOC_RAM_MPLobby_update.exe patch.
Of course if none of that works, you can try opening the case and removing some of the RAM. And the problem could be elsewhere -- for example your video drivers might be "too new" for the game.